So I've JUST realized that a colleague of mine is in Boston for the week..

Whats a good store to buy from that will deliver before he leaves on Saturday?
(Or locations of store he can walk into)
Is there price-matching and how does it work?
Really need a few quick replies on this guys..

and I need more opinions and options... Roccat Kave vs Tritton 510 HDA vs some cans in sameish price range..

And xonar dx good for these to be driven from?
How easy is it to also set-up 2.0 speakers at the same time
(I can turn off whichever I'm not using but would like standard stereo from the speakers at same time as 5.1 from headset if I go for them.)